What did the court decide in Martinez v. Court of Appeal of California, Fourth Appellate District?
Answered for: US
we conclude that neither the holding nor the reasoning in Faretta requires California to recognize a constitutional right to self-representation on direct appeal from a criminal conviction
The Court held that the Faretta right to self-representation does not extend to direct appeals, while noting states may recognize such a right on their own. The sentence above is the court in its own words.
This answer is true in US and nowhere else on this site. Another jurisdiction is another answer, or an honest gap: see what has been read for US.